Add env variable in gclient recurse with repo path
Add env variable in gclient recurse with repo path

- This will be used by navabi to have his gclient recurse
  command print the current repo.

R=maruel@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11308115

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@169812 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools